Add embedded sharing to Google Play Music from Chrome ext.

chrome/src/google.js

@@ -0,0 +1,51 @@
+const apiUrl = 'https://match.audio';
+
+var button = document.createElement('button');
+button.className = 'share-button';
+button.setAttribute('aria-label', 'Share to Match Audio');
+
+var buttonContent = document.createElement('div');
+buttonContent.className = 'button-content';
+button.appendChild(buttonContent);
+
+var paperRipple = document.createElement('paper-ripple');
+paperRipple.class = 'circle';
+buttonContent.appendChild(paperRipple);
+
+var background = document.createElement('div');
+background.id = 'background';
+background.className = 'style-scope paper-ripple';
+paperRipple.appendChild(background);
+
+var waves = document.createElement('div');
+waves.id = 'waves';
+waves.className = 'style-scope paper-ripple';
+paperRipple.appendChild(waves);
+
+var img = document.createElement('img');
+img.src = 'https://match.audio/images/logo-128.png';
+img.height = 48;
+buttonContent.appendChild(img)
+
+var buttonLabel = document.createElement('div');
+buttonLabel.className = 'button-label';
+buttonLabel.setAttribute('aria-hidden', true);
+buttonLabel.innerText = 'Match Audio';
+buttonContent.appendChild(buttonLabel);
+
+// select the target node
+document.addSelectorListener('.share-buttons', (event) => {
+  var input = event.target.parentElement.querySelector('paper-input input');
+  // Check that it's an album or track, and not a playlist
+  const match = input.value.match(/https:\/\/play\.google\.com\/music\/m\/([a-zA-Z0-9]+)/);
+  if (match) {
+    event.target.insertBefore(button, event.target.firstChild);
+    button.addEventListener('click', (event) => {
+      if (match[1].startsWith('T')) { // Track
+        window.open(apiUrl + '/google/track/' + match[1], '_blank');
+      } else if (match[1].startsWith('B')) { // Album
+        window.open(apiUrl + '/google/album/' + match[1], '_blank');
+      }
+  	});
+  }
+});